Electric furnace.



PATENTED FEB. 21,1905.

J. M. MOEEHEAD. ELECTRIC FURNACE. APPLIOATION FILED 00119, 1903.

GAS.

WATER. CHARGE.

llllllllllllmml flAMH llI-dI- h 4 w UNITED STATES ratentecrebm ry 21. 1905.

PAT NT ()FFICiZ".

JOHN, MOTLEY MOREHEAD, or CHIGAGO,' ILLINOIS, ASSIGNOR TO UNION CARBIDE COMPANY, or CHICAGO, ILLINOIS, A CORPORATION or v a GINIA.

ELECTRIC FURNACE SPECIFICATION forming part of Letters Patent l\[o. 782,917, dated. February 21,- 1905.

Application filed October 19,1903. Serial 110,177,603.

To'all whom it may cncern.--

Be-it known that'l, JOHN MOTLEY Moan- HEAD, a citizen of the'United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Electric Furnaces, of. which the-following is a specification.

This electric furnace is especially intended for the production of calcium carbid, and is an improvement; on the "one described in my United StatesP'atent No. 664,333, granted "December 18, 1900. .The patented furnace comprisesa working chamber, a hood depending into this chamber, electrodes within, and a waste-gas outlet from the hood, and means -'for feed-ingthe charge around the hood. The

charge surrounding and sealing the lower end of the hood served asa seal to exclude 7 air and direct the waste gasesinto the'hood.

I have now found that the charge may advantage usly be fed directly into the hood and -;that the waste gases will still collect in thehood, although they are obliged to pass through'aconsiderable body of the charge on their way to the gas-outlet.= This somewhat unexpected movement ;of the gases-upward through the'charge within'the: hood, instead of out beneath the *skirtofthevhood-is be-xv lieved to be'due to thefactthattheg ases risf ing from the zone of reaction" at the lower ends of. :the, electrodes tendl-to work Q upward through the charge along the electrodes and Fig. 1;

thatthey willthns pass along the electrodes through a path of greater length than through the charge itself. The new construction enables the furnace. to be operated with great regularity and without filling'the surrounding atmosphere with dust fromthe finely-di id d charges" j 4 I The inven' ion will be readily understood by reference to the accompanying drawings, in

- to the proper height.

of which consists of a'wheel 1 with removable cover-plates 2. An iron hood 3 depends into the open end of the working chamber. f- The depending electrodes 4 are carried invertically-adjustable holders 5. The top of the hood is closed by a plate 6,0f cast-iron,within which is a cooling-chamber 7 havinga Waterinlet pipe 8 and an outlet-pipe 9. Parallel openings 10 to receive the electrode-holders:5 extend vertically through this cover-plate. These openings are preferably somewhat larger than the electrode-holders,and a refractory luting 11 is filled into the intervening space when theelectrodes have been adjusted A pipe 12 for introducing the charge leads through the top of the hood behind the electrodes, and another pipe, 1 3,, for withdrawing the waste gases leads from the hood in front of theelectrodes.

In operation the electrodes are adjusted to the proper height'and thecharge is fed in through pipe l2 nntil it'fills'aconsiderable.

portion of the hood, and thus seals its lower. 1 end. The depth of the seal may be increased, ifinecessary', by pulling some of the charge outward beneath the skirtiofy-the hood. Water is continuously circulated through the. cover during the operation of the furnace-{and the i I waste carbon ineno'icid q ui'etly escapes through the pipe 13; 15" R,

It is obvious that a hood ot talcum:

tion may advantageously, be employed, in electriefurnacesot', other types and "for. the '1 production of other materials thaa calciu'm i carbid.

1. An electric furnace, comprising-a work' ing chamber,-ahood dependingintosaid-chmm I withdrawing the waste gases from the hood,

as set forth;

3. An electric furnace, comprisinga work ing chamber, a hood dependinginto said chamber, electrodes passing through openings in said hood, and means for introducing; the charge into the hood, as set forth.

4. An electric furnace, comprising Working chamber, a-hood clependingintosaid chamber, electrodes passing through openings in said hood, and means for' introducing the charge into the hood and withdrawing thewaste gases from the hood, as set forth.

5. An electric furnace, comprising a Working chamber, a hood depending into said cham ber, means for cooling the top of said hood, an electrode or electrodes passing through openings in said top, and means for introducing the charge into the hood, as set forth.

JOHN MOTLEY MOREHEAD.

Witnesses:

J JACKSON, G. FULLER. 

